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USAMO 2018 Problem 1

  • Day 1

Let a,b,ca,b,c be positive real numbers such that a+b+c=4abc3a+b+c=4\sqrt[3]{abc}. Prove that 2(ab+bc+ca)+4min⁡(a2,b2,c2)≥a2+b2+c2.2(ab+bc+ca)+4\min(a^2,b^2,c^2)\ge a^2+b^2+c^2.

Dataset text AI-MO AoPS. Quoted with source.

Also USAJMO 2018 Problem 2.

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